// JavaScript Document
var minTextSize = 0.7;
var maxTextSize = 1.5;
var defaultSize = 0.9;
var textSizeUnits = 'em';


function modifyTextSize(adjust)
{
	bodySize = document.body.style.fontSize;
	currSize = Number(bodySize.substr(0, bodySize.length - 2));
	newSize = Number(currSize) + Number(adjust);

	if (newSize < Number(minTextSize))
		newSize = minTextSize;

	if (newSize > Number(maxTextSize))
		newSize = maxTextSize;

	if (adjust == null)
		newSize = defaultSize;
	else if (Number(adjust) == -99)
		newSize = defaultSize;

	createCookie('textAdjust', newSize - defaultSize, 28);

	document.body.style.fontSize = newSize + textSizeUnits;

	return true;
}

function createCookie(name,value,days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else
		var expires = "";

	document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for (var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ')
			c = c.substring(1,c.length);

		if (c.indexOf(nameEQ) == 0)
			return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name)
{
	createCookie(name,"",-1);
}